Parameter Selection Method for Linear Discrete Element Model of Particle Damper

doi:10.7652/xjtuxb201403018

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Parameter Selection Method for Linear Discrete Element Model of Particle Damper

更新时间：2025-04-29

- Parameter Selection Method for Linear Discrete Element Model of Particle Damper
- Vol. 48, Issue 3, Pages: 96-101(2014)
- 作者机构：
  
  西安交通大学机械结构强度与振动国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201403018
  CLC： O121.8;G558
- Online First：10 March 2014，
  
  Published：2014
- 稿件说明：
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Parameter Selection Method for Linear Discrete Element Model of Particle Damper[J]. 2014, 48(3): 96-101.
DOI：

Parameter Selection Method for Linear Discrete Element Model of Particle Damper[J]. 2014, 48(3): 96-101. DOI： 10.7652/xjtuxb201403018.

摘要

为了研究不同形式颗粒阻尼的减振特性及其在旋转条件下的阻尼效果

建立颗粒阻尼的线性离散元模型

提出了一种颗粒接触线性模型的参数选取方法。根据Hertz接触非线性模型

假设颗粒相对运动在达到屈服极限时

Hertz接触模型接触力所做的功和线性模型接触力所做的功相等

对颗粒接触的力和位移的关系进行了线性化处理; 利用离散元法对重力场下不同材料的非阻塞性颗粒阻尼(NOPD)、柔性约束颗粒阻尼和旋转条件下的NOPD进行建模; 根据颗粒材料的屈服强度、泊松比、弹性模量等物理属性确定了仿真计算的相关接触参数。与实验确定颗粒接触参数的方法相比

所提方法适用范围更广。数值计算结果与实验结果在趋势和数值上吻合得较好

为颗粒阻尼的进一步研究奠定了基础。

Abstract

To investigate the damping effects of different kinds of particle dampers(PDs)and the vibration properties of PDs under centrifugal loads and establish the linear discrete element models

a parameter selection strategy for PDs linear contact model is introduced. According to the Hertz nonlinear contact model

it is assumed that an equivalent linear spring stores the same amount of energy up to a similar yield force for a Hertzian model

and the relationship between the force and the displacement of two particles is treated as linear. The discrete element method is used for modeling non-obstructive particle damper(NOPD)

and bean bag damper under gravity and NOPD under centrifugal loads. The contact parameters are determined by means of the granular material properties

such as yield strength

Poisson's ratio

elasticity modulus etc. Compared with the experiments for contact parameter of particle dampers

this strategy is suitable for a wider application range. And the simulations coincide well with the experiments

in both quantitative values and evolving trends.

关键词

Keywords

references

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